Smoke-preventing apparatus.



R. H. BURNS.

SMOKE PBEVENTING APPARATUS.

APPLIGATION FILED APR.27, 1909.

936,088. Patented ot.5,19o9.

VIII

WHNESSES:

oTZHB/Wns ATTQRNEYS,

UNITED srarnspiqisnr l1er-aros.

ROBERT H. BURNS, OF WOODHAVEN, NEW YORK.

SMOKE-PREVENTING APPARATUS.

To all whom it may concern:

3e it known that I, ROBERT I-l. Btu-ms, a citizen ot the TUnited States, residing at YvVoodhaven, in the county of Queens and State of N ew York, have invented new and useful Improvements in Smoke-Preventing .ipparatus, ot which the following is a specification.

In my application for U. S. Letters Patent- No. 617,805, issued 1T January 1899 I described smoke preventing apparatus. This invention relates to apparatus for accomplishing a like result and the invention resides in the novel features of construction set forth in the following specification and claims and illustrated in the annexed drawing in which Figure l shows a side elevation otl a flue or smoke passage made to contain this invention. Fig. 2 is a vertical central section along the tlue of Fig. l. Fig. 3 is a view like Fig. 2 showing parts in a different position. Fig. e is a section along the' line ai a? Fig'. 2.

In the drawing is shown a flue a which has a portion adapted to receive or form a bearing for a journal o which carries a damper The journal is hollow and adapted to allow entry of air from outside the line. The air entering by way ot the journal Z) can pass through outlet or passage f as presently explained. The damper c has a portion provided with a passage or hole (Z. vWhen the damper is swung to position as indicated in Fig. 2 the damper closes the Hue except for the passage d.

An auxiliary damper c is made to swing on the main damper c. Then the main damper is in the position shown in Fig. 2 the auxiliary damper stands ott somewhat from the main damper. Air entering through the journal o and opening f can pass through pertorations g at the edge portion of the auxiliary damper. Then the main damper c is swung toward the auxiliary damper e the two damper-s co-act to form a chamber. As the perforations g are beyond the periphery of the main damper c the chamber formed by the contacting or superposed dampers c c is closed and the entry of air through opening f is arrested.

Specification of Letters Patent.

Application filed April 27, 1909.

Patented Oct. 5, 1909.

serial No. 492,465.

The auxiliary damper c has a portion il. cai ried by or cast on arm z' from auxiliary daniper e. IVhen the main damper c starts toward the position from Fig. 2 to Fig. 3 said main damper will come to position to have the passage (Z closed by the portion 71,. The main damper has by that time swung sonrewhat out of contact with the flue to allow passage therethrough. IVhen the dampers are swung to the position shown in Fig. 3 the passage through the flue both below and above the dampers is tree. This will allow full passage for -products otl combustion through the llue. In the position shown in Fig. 3 current or draft through passage f is cut off. The chamber formed by the co-actA .ing dampers c c being closed entry of air from is prevented. As the dampers swing to the position shown in Fig. 2 for the auxiliary damper c as it is held back to tree or uncover the damper c air from entry f can pass through perforations g in a counter direction or direction opposite to that taken by fumes or smoke traveling through the iiue or to a chimney.

A handle le is suitably applied so that the damper c can be suitably swung or manipulated. The handle 7c has a seat for a spring fm.. This spring can cause suitable friction against a rim 0. The dampers set by the handle are held by the friction appliance m against accidental movement and will remain in the position required. As the dampers are set to various angles or posit-ions from Fig. 2 to Fig. 3 the draft of the flue can be modified. Such regulation enables the combustion to be controlled so as to avoid or prevent the production of smoke.

I claim l. In a device of the kind described a damper adapted to form a chamber wall and an auxiliary damper made to swing on the .iirst damper and adapted to form a second wall of the chamber said main damper having a passage therethrough, and said auxiliary damper having a closing portion adapted to co-act with the main damper to close the passage.

2. In a device of the kind described a damper adapted to lit a flue and having a passage therethrough, an auxiliary damper made to swing on the main damper to form my hand in the presence of two subscribing :L chamber and having a portion adapted to Witnesses. close the passzwe throuUh the main damper Said auxiliary bdamperbbeing made to holdi ROBERT H' BURNS' 5j the closing portion Clear of the main damper Vitnesses:

when the latter engages the flue Wall. WV. C. HAUFF,

In testimony whereof I have hereunto set 1 CHRISTIAN ALMSTALDT. 

